Device controller with low power standby mode

• US 6,292,233 B1
• Filed: 12/31/1998
• Issued: 09/18/2001
• Est. Priority Date: 12/31/1998
• Status: Expired due to Term

• Current Assignee: STMicroelectronics SRL (STMicroelectronics NV)
• Original Assignee: STMicroelectronics SRL (STMicroelectronics NV)
• Inventors: Erba, Gianluca, Grilli, Fabio
• Primary Examiner(s): Kostak, Victor R.
• Application Number:
  US09/224,261
• Time in Patent Office: 992 Days
• Field of Search: 348/730, 348/734, 348/553, 363/17, 363/21, 315/411, 307/43, 307/132, 307/116, 307/125, 307/126, 307/128, 307/130, 307/64, 307/65, 455/343
• US Class Current: 348/730
• CPC Class Codes: H02J 9/005 using a power saving mode for copiers G03G15/5004
• CPC Class Codes: H02M 1/0032 Control circuits allowing low power mode operation, e.g. in standby mode
• CPC Class Codes: H02M 3/28 using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
• CPC Class Codes: H04N 5/63 Generation or supply of power specially adapted for television receivers
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A device controller controls access to a device, such as a television, having a power input for receiving power and a data input for receiving control data. When in standby mode, the device controller disconnects the device from a power source, such as the AC mains of the building in which the device is situated. As a result, in standby mode only the device controller is powered, which uses much less power than prior art devices in standby mode. The device controller includes an input device structured to provide control data based on control instructions received from a user, a power switch coupled between a power source and the device power input, and a data coupler coupled to the device data input and structured to convert electrical data into non-electrical data and back to the electrical data for delivery to the device data input. The device controller also includes a controller structured to cause the data coupler to provide the control data to the device data input, decode the control data, and if the control data indicates that the user desires to turn on the device when in standby mode, then causes the power switch to deliver power from the power source to the device power input.

Claims

1. A device controller for controlling access to a device having a power input for receiving power and a data input for receiving control data, comprising:

an input device structured to provide control data based on control instructions received from a user;

a triac coupled between a power source and the device power input, the triac having a control terminal;

a data coupler coupled to the device data input and structured to convert electrical data into non-electrical data and back to the electrical data for delivery to the device data input; and

a controller coupled to the input device and data coupler and coupled to the control terminal of the triac without an intervening coupling device that converts electrical signals into non-electrical signals and back to the electrical signals, the controller being structured to cause the data coupler to provide the control data to the device data input, decode the control data, and if the control data indicates that the user desires to turn on the device when in standby mode, then causes the switch to deliver power from the power source to the device power input.

2. The device controller of claim 1 wherein the data coupler includes a photocoupler.

3. The device controller of claim 1 wherein the input device includes a receiver that receives control signals from a remote control unit operated by the user.

4. The device controller of claim 1 wherein the controller includes a microcontroller programmed to control the triac and provide the control data to the data coupler based on the control data received from the input device.

5. The device controller of claim 1, further comprising:

a power supply stage coupled between the power supply and the triac and coupled to the controller to supply power thereto, the power supply stage having a ground that is different than a ground of the device.

6. The device controller of claim 5 wherein the power supply stage includes a clamping element that converts a relatively high voltage of the power source to a relatively low voltage suitable for powering the controller, a filter element that filters out AC elements of the voltage of the power source, and a delay stage that limits current in-rush to the filter element when power is supplied initially from the power source.

7. The device controller of claim 6 wherein the clamping element is a zener diode and the delay stage includes a series connection of a resistor and a capacitor that are connected to a terminal of the power supply.

8. The device controller of claim 1 wherein the device is a television and the controller is a microcontroller programmed to provide the control data in a format compatible with the television.

9. A television controller for a television having a power input, comprising:

an input device structured to provide control data based on control instructions received from a user;

a triac coupled between a power source and the television power input, the triac having a control terminal and disconnecting the television power input from the power source when in a standby mode;

a power supply stage coupled between the power supply and the triac and coupled to the input device to supply power thereto during the standby mode, and

a controller coupled to the input device and power supply stage, and coupled to the control terminal of the triac without an intervening coupling device that converts electrical signals into non-electrical signals and back to the electrical signals, the controller being structured to decode the control data, and if the control data indicates that the user desires to turn on the television when in standby mode, then cause the triac to deliver power from the power source to the television power input.

10. The television controller of claim 9 wherein the television has a data input, the television controller further comprising a data coupler coupled between the controller and the television data input and structured to convert electrical control data from the controller into non-electrical data and back to the electrical control data for delivery to the television data input.

11. The television controller of claim 9 wherein the data coupler includes a photocoupler.

12. The television controller of claim 9 wherein the input device includes a receiver that receives control signals from a remote control unit operated by the user.

13. The television controller of claim 9 wherein the power supply stage includes a clamping element that converts a relatively high voltage of the power source to a relatively low voltage suitable for powering the controller, a filter element that filters out AC elements of the voltage of the power source, and a delay stage that limits current in-rush to the filter element when power is supplied initially from the power source.

14. A television having a standby mode of reduced power use, comprising:

a main microcontroller that controls how images are displayed on the television;

a main power circuit that receives power from AC mains of a building in which the television is used; and

an input controller that includes;

an input device structured to provide control data based on control instructions received from a user;

a triac coupled between the AC mains and the main power circuit, the triac having a control terminal and disconnecting the main power circuit from the AC mains when in a standby mode;

a power supply stage coupled between the AC mains and the triac and coupled to the input device to supply power thereto during the standby mode, and

a controller coupled to the input device and power supply stage, and coupled to the control terminal of the triac without an intervening coupling device that converts electrical signals into non-electrical signals and back to the electrical signals, the controller being structured to decode the control data, and if the control data indicates that the user desires to turn on the television when in standby mode, then cause the triac to deliver power from the AC mains to the main power circuit.

15. The television of claim 14 wherein the input controller further includes a data coupler coupled between the controller and the main microcontroller and structured to convert electrical control data from the controller into non-electrical data and back to the electrical control data for delivery to the main microcontroller.

16. The television of claim 14 wherein the data coupler includes a photocoupler.

17. The television of claim 14 wherein the power supply stage includes a clamping element that converts a relatively high voltage of the AC mains to a relatively low voltage suitable for powering the controller, a filter element that filters out AC elements of the voltage of the AC mains, and a delay stage that limits current in-rush to the filter element when power is supplied initially from the AC mains.